CVE•Published 2026-05-12•Modified 2026-05-18•0 articles on news•4 live references•NVD data

CVE-2026-33603Dovecot · Dovecot

Vulnerability data via NVD (ingested)

CVSS v3.1

6.8

MEDIUM

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS percentile

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Weaknesses (CWE)

CWE-99Improper Control of Resource Identifiers ('Resource Injection')

Description

Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position itself between Dovecot and the client connection. If successful, the attacker can eavesdrop communications between Dovecot and client as MITM proxy. Install fixed version. No publicly available exploits are known.

Timeline

Published 2026-05-12

Modified 2026-05-18

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common). Live host counts are a Premium feature.

Shodan · vuln tag

vuln:CVE-2026-33603

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Dovecot Dovecot"

All exposed Dovecot Dovecot instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Dovecot"

HTTP body or banner mentions "Dovecot" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-33603